Method of treating articles being galvanized



METHo oF HEATING ARTICLES BEINQQGALVANIZED Filed im. 25, 1925 Patented July 3, 1928.

UNITED STATES PATENTl OFFICE.

APPLIANCE COMPANY, F EVERETT, CEUSETTS.

MASSACEUSETTS, A CORPORATION 0F MASSA- HETHOD OF T-BEATING ARTICLES BEING GALVANIZED.

Application mea December 2s, 1925. serial No. 77,250.

When small articles are to be hot gale yvanized .they are first suitably'r pickled and it is then common practice to place them in a wire or perforated sheet metal basket 5 which is dipped in molten zinc` The basket is then removed from the zinc and thoroughly shaken or'placed in a centrifugal machine where it is rotated rapidly, either action causing most of the excess zinc to be removed from the articles. Either of these actions, however, is insufficient in .man instances to produce a uniformly smoot coatin on the larticles and it has therefore lbeen t e practice to throw on to the hot articles while they are bein shaken or after they have been centrifuge a iux, such as sal ammoniac, zinc ammonium chloride,

boric acid, etc. While this acts improve the smoothness of the coating, 1t 1s often not entirely satisfactory, because many of the articles or portions thereofare often out of reach of the sal ammoniac or other flux which is thus ineffective to act upon them.

This invention provides a method and ap paratus by which the ux is caused to act on all the articles and all portions of each,

' so that uniform, smooth, galvanizing throughout is effected. This is accomplished by vaporizing the ux and passmg 3o the vapors through the basket, preferably by operatively associating with and below the basket a hot late on which the flux may be thrown in lsuc manner that it is vaporized and the vapor passes up and through the basket and reaches all parts of each of the coated articles.

Preferably means are provided for enclosing the basket so as to cause substantially all of the fumes or vapors to pass theref 4o throughbefore escaping.

For a more complete understanding of this invention, referencegmay be had to the accompanying drawin in which y l Figure 1 is a toppanview of an a paratus designed "to carry out the metho of this invention. y

ligure 2 is a section on linev2-2 of Figure-,1. 1

FigureSisadetailsectiononline-S ofFl 2.

' 'tothesedrawing8,1ind1 cates chine' and rotated at a rapid rate, t

the side Wall of a casing' having a removable cover 2 preferably hinged as shown at 3 in Figure 3, and formed when in closed position to make a substantially tight it with' the upper edges of the side wall 1.

This casing is provided with an elevated base plate 4 beneath which is positioned a suitable heating element 5, hereln shown as a gas burner. Within the casing isv positioned vertically a tubular member 6 designed to receive therein a basket 7 for containing the articlesbeing galvanized. The upper end of the teubular member .6 is preferably fiared outwardly as at 8 to facilitate the placing of the basket therein, and the basket, according to the-'usual construction,

vis provided with oppositely disposed loops 10 through which'may be passed hooks 11 attached topa lifting bar 12. At diammetrically opposlte points the wall portion 1 may be lprovlded with slots as 111 to receivethe bar 12 so that the basket may be suspended within the tubular member 6. This tubular member, asshown, is supported within the casing by means of braces such ai 115 and at its lower end there isprefera communicating therewith the upper' en of a frusto conical baie llate 16, the

larger end thereof resting on t e base platey 4. At 17 is shown a passageway leading from without the container through an.- o ening 18 normally closed by means of a. suitable shutter 19 through the baile 16 so that through `this-passage the flux ma be inserted into the casing and deposited on the hot base plate 4.

The basket 7 may be of the type ordinarily employed for galvanizing in which the articles are placed in mass `before being dipped in the mplten vzinc after havingbeen pickled. On removal from the zinc'bath the basket with its contents is either shaken thoroughly or placed in a centri ma wing oi most of the excess zinc from the articles. On removal from the centrifugalmachine or after being thoroughly shaken and while the articles are still very ot, the basket with its contents is placed mthe within the tubular member 6 and the cover 2 is closed. lThe ux is then inserted through the passage l? as hy means of a shovel and thrown or scattered on the hot plate 4l, whereupon itis immediately vaporizccl and the vapors pass upwardly through the basket coming into contact with all portions of the articles therein,4 and escape through the exhaust pipe 2O which communicates With an opening through the casing above the basket. in some cases it may be found desirable to shake or otherwise agitate the articles While they are heing subjected. to the vapor treatment, particularly Where the articles,such

as Washers, have a tendency to pack closely together, the agitation aiding by permitting' the vapors to reach all parts ot each article. Att-er this treatment the loasket with its cony tents is removed from lthea casing ancl the articles thereafter treated in the usual man-- lWhile one form of apparatus capable of heing used for carrying out this process has heen isclosefi9 it will he evident to those- I Y the process of galassia nag artrcles which comprise vaporiaing and. that many may he Lacasse flux, and passingthe vapor through a mass of the hot zinc coated articles.

2. Those steps in the process of galvanizing articles which comprise dipping the articles in melted zinc, removing the greater part of the excess zilc, vaporizing a hun, and passing the vapors through a mass of the zinc coated articles While they are still hot from the dipping operation.

3. rlhe method of galvanizing articles which comprises dipping the articles in melte zincucentrifuging the articles, and passing vapors of a ux through a mass of the centrifuged articles While they are still hot frm the dipping operation.

t. That' step in the process of galvanizing articles which comprises passing a vaporize tlun through a mass of the hot zinc coateol articles. y

5. rthe steps in the methool et galvanizing articles which comprises suhiecting a mass ot the het Zinc coated articles to a vaporizccl ilus While agitating saint 6. The steps in galvania rticles which comprise enclosing het Zinc tea'L ticles, ana subjecting the articles While enclose-:l to a vapcrisesl ln testh'nony whereof l have my signs-titre titl 

